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Get AWS temporary credentials ready to export based on a MFA virtual appliance
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Scroll up (or Down (PgDn)) in any terminal session (except KDE)

Get full from half remembered commands
Show all commands having the part known by you. Eg: $apropos pdf | less

unbuffered tcpdump
Sometimes the question comes up: How to get unbuffered tcpdump output into the next program in the pipe? i.e. if your OS forces you to wait for the buffer to fill before the next program sees any of the output If you use -Uw- then you can't use -A (or -X or -XX) at the same time. When the question comes up, I've never seen anyone suggest this simple solution: chaining 2 tcpdump instances.

check open ports without netstat or lsof

Stat each file in a directory
Possible simplification of egrep-awk-sort with find and -exec with xargs.

Reverse ssh
Both hosts must be running ssh and also the outside host must have a port forwarded to port 22.

grep for minus (-) sign
Use flag "--" to stop switch parsing

1+2-3+4-5+6-7 Series


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